Sedative and hypnotic ureides



Patented J rmana'rcrii sea en. or

saiwrrva'mn mno'rrc uni pas.

Io Drawing. Application and as... a, me;

This invention I relates to production of certain acetyl urea derivatives according to the formula small quantities of several hours.

hol and glycerine,

Hitherto only compounds" of this kind, wherein R and B". were iormed by equal The compound is easily soluble .in hot alcodifiiculty soluble in ether, practically insoluble in water.

2; Into a solution of 141 parts, by weight,

I of isopropyl-allyl-acetamide' (freezing-point 107 C.) in carbon tetrachloride, 47 parts, by weight, of cyanic acid are introduced at 0 C. Hereupon the reacting mixture is heated ior several hours under pressure to -110 C. Upon cooling-down theseparated crystalline reaction product is filtered off, extracted with alcohol to remove any cyamelidepos- 3. 7 .5 parts of sodium metal are dissolved in a solution of 70 parts, by weight, of secondary butyl-malonic acid di-ethylester in 75 parts, by volume, of absolute alcohol. After addition of 47 parts, by weight, of allyl bromide the mixture is refluxed for 8 hours. Then the alcohol is distilled off, the residue dissolved in water, the solution extracted by ether, and the' ethereal solution 'dried by I vention may ride are well mixed with only be used as sedap WIN-BARBIE, GEBH JAIY.

Serial 10-135507, anddn' Germany la ch 8, ma.

cal for instance, ha e been proved superior in these respectsto several com'pounds ofv the barbituric acid tyipe.

The "new cogipoun s according to my insponding to the principles of orgamcchem istry, but the best results have been obtained by the action of urea on the chlorides of the respective alkyl substituted acetic acids.

Examples.

1.'63 parts of isopropyl-allyl-acetyl chlo- 48 parts of urea. The mixture is allowed to stand for several hours and then heated in a steam bath for 6 hours. The mixture gradually solidifies to a cake of. crystals. which is pulverized and well extracted ing the resldue from alcoholic solution, 60

dles showing a 191 C.

The reaction takes place" according to the,

following equation:

siblycontained and recrystallized from alcoholic solution. The remain er of the ureide contained in the filtrate uct may be obtained in pure form b distilling ofi the carbon tetrachloride an recrystallizing the residue from alcoholic solution. The properties of the isopropyl-allyl-acetyl to example 1. This reaction corresponds to equation no r'o i-a uylmcylmade. means of Na SO,.. By distilling ofi the ct r, sec. butyl-allyl-malonic ester .is obtained showing a boiling-point of to 148 C. at a pressure of 12 mm.

To saponify the ester obtained, 64 parts, by weight, of the sec. butyl-allyl-malonic ester are gradually added to a concentrated aqueous solution of 84; arts of caustic potash, and the mixture is kept boiling durproduceddn any way corre-..

from the raw produrei'de. thus obtained. correspond to those of the ureide produced according with water. By recrystallizthe following 36 parts of sec. butyl-allyl-acetic acid are heated in a steam bath with 72 parts of thionyl chloride, until no more hydrochloric acid gas is developed. The reaction product is subjected to fractional distillation, whereby the sec. butyl allyl-acetyl chloride is obtained, the outout'being almost theoretical. I

after recrystallization from alcoholic solution, yields the sec. butyl-allyl-acetyl ureide; it forms fine crystals having a freezing-point of, 147-148 C. It is easily soluble in hot alcohol, ,difficultly soluble in ether and practically insoluble in water.

The several steps of this process are illustrated by the following equations:

(a.) '03,.011, coo 0.1a. CHI-CH1 CH 0N8. C H Br- CH OOOCgHg NaBr on 000 011/. o

Cd! COCOIH Sec. butyl-allyl-malonic ester. a) 011, on, on, on,

cooo,m )1? 9 CH o 2 KOE 1 on. o 2 0,1501:

0,11. 0000,11. cm. COOK Potassium salt of sec. butyl-allyl-malonle acid. (0.) 01!..011. 0115011,

CH; O CH; CH COOH 00 CgH 000E 03H;

Sec. butyl-ellyl acetic acid. ((1.) CH] CH] CHI-CH1 on. cEoooH soc], on, 011.0001 so, H0!

CIHI Sec. butyl-allyl-acetyl chloride. (0.) CHI-CH: CHLOE:

CH CH CH; CHCOCI +NH .CO.NH CH CHCONBLCONH: HCl

l i l 4.. The process of producing a sedative and hypnotic compound which consists in acting" with urea on a di-alkyl substituted acetyl chlorlde, one of the alkyl radicals at least being non-saturated.

5. The process of producing a sedative and ypnotic compound which consists in acting.

Sec. butyl-allyl-seetyl ureide.

with ureau on an alkyl-allyl-acetyl chloride. 6. The process of producing a sedative and hypnotic compound which consists in acting with urea on isopropyl-allyl-acetyl chloride.

7. As an article of manufacture and trade, a sedative and hypnotic compound consisting, of the ureide of a di-alkyl substituted acetic acid, one of the alkyl radicals being nonsaturated and the other containlng a branched carbon chain.

8. The process of producing a sedative and hypnotic compound which consists in acting .With urea on a di-alkyl substituted acetyl chloride, one of the alkyl radicals being nonsaturated and the other containing a branched carbon chain.

In testimony whereof I afiix my signature.

FRIEDRICH BOEDECKER. 

